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Thomas Sharkey Snr, Bridget and Thomas Jnr died following the fire

A CCTV analyst has told a trial that one of the men accused of murdering a father and his two children was captured on film minutes before the fatal fire.

Det Con Jennifer Bell told the High Court in Glasgow that she viewed the clip, taken from a camera at the Shopsmart store in West Princes Street, Helensburgh, at least 100 times.

Scott Snowden, 37, and Robert Jennings, 50, deny murdering Thomas Sharkey and his two children family by torching their home in Helensburgh.

Thomas Sharkey Jnr, 21, and his sister, Bridget, eight, died in the blaze at their home in Scott Court. Their father, Thomas Snr, 55, died in hospital days later.

Both accused also deny a charge of attempting to murder Mr Sharkey's wife, Angela, 48, who survived the fire.

Det Con Bell told the court she was in Govan police station on 6 June 2012 and asked to help with a prisoner who was being processed in the cells.

As soon as he walked down the corridor in front of me I turned to my colleague and I said: 'Oh my God. That's the walk I've seen on the CCTV from Shopsmart'Det Con Jennifer Bell

She told prosecutor Alex Prentice QC: "On completion of seizing items from Mr Jennings in the cell, a turnkey came to the cell to remove Mr Jennings.

"When he was removed my colleague and I were putting clothing in evidence bags. He passed us and walked down the corridor.

"As soon as he walked down the corridor in front of me I turned to my colleague and I said: 'Oh my God. That's the walk I've seen on the CCTV from Shopsmart'."

Det Con Bell, who is a member of the major investigations team and has worked on anti-terrorism investigations, including the 7/7 bombing and the 27/7 bomb plot in London, was asked what it was she noticed about the walk and told the jury: "It's as if his feet are faster than the rest of his body, a kind of shuffle."

She told the court she had observed the walk in the corridor for about 10 to 15 seconds.